我厂生产的外销产品170t电动轮汽车,其举升油缸筒长1416.05mm,孔径φ203.20~(+0.13)mm,外径φ228.42~(+0.12)mm,并要求内外圆的同轴度在全长上允差≤0.076mm。工艺过程如下:缸筒内孔经粗镗、精镗、滚压后,以内孔为基准,精车和磨外圆至成品。内孔经镗削和滚压后,表面光洁度达▽8以上,它在做定位基准过程中不容许损伤。且加工中油缸筒端面 I plant the production of 170t electric car for export products, the lifting cylinder length 1416.05mm, aperture φ203.20 ~ (+0.13) mm, outer diameter φ228.42 ~ (+0.12) mm, and the requirements of the coaxial Degree of tolerance on the whole length ≤ 0.076mm. Process is as follows: Bore bore through rough boring, fine boring, rolling, with the hole as a benchmark, fine car and grinding cylindrical to the finished product. After boring and rolling the inner hole surface finish of ▽ 8 or more, it does not allow damage in the positioning of the benchmark process. And processing cylinder surface